Sonoma Mtn RD over Matanzas Creek
FairSonoma County, California · 0.5 MI S Bennet Valley RD · Structure no. 20C0264
- Built
- 1930
- 95 years old, rebuilt 1969
- Condition
- Fair
- inspected April 2024
- Type
- Slab
- Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 1,400
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Sonoma Mtn RD over Matanzas Creek is a concrete slab carrying Sonoma Mtn RD over Matanzas Creek in Sonoma County, California. It was built in 1930 and reconstructed in 1969, so it is 95 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,400 vehicles a day, roughly 1% of them trucks, projected to reach 642 by 2046. The structure is 24 ft (7.3 m) long and 32 ft wide. If it were closed, the detour would be 14.9 mi (24 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sonoma Mtn RD over Matanzas Creek built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1969.
What condition is Sonoma Mtn RD over Matanzas Creek in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.
How much traffic does Sonoma Mtn RD over Matanzas Creek carry?
About 1,400 vehicles per day (2015 count), of which roughly 1% are trucks.
How long is Sonoma Mtn RD over Matanzas Creek?
The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 32 ft wide.
Who owns Sonoma Mtn RD over Matanzas Creek?
It is owned by the County Highway Agency.